Dark, brown menstruation may be a sign that it is 'old' blood. Sometimes blood stays in the uterus for a few days before your period 'starts'...it could be because it is a light flow or that the cervical opening is very narrow making it difficult for the blood to exit. Light flows and dark blood could also occur because of dehydration.
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The blood is more brown tinged toward the end of the period due to the amount of "old" blood being in the mix. The brown is brought on by dead red blood cells and bilirubin content.
There is nothing wrong with brown blood at the end of the menstrual cycle, it is oxidized blood. This means you are nearing the end of they cycle and your body is "cleaning" itself out.
normally the dark blood will appear at the end of your period, because it is the lining that is coming out.
As I am not a professional medical doctor or the likes, I don' t know the reason behind it but, from experience, don't drink anything cold.
Period blood can be dark brown, light brown, dark red or red. Sometimes your period is brown if it is a light period. Sometimes your period can be brown near the end of your period.